Core Role of the CBR-PEM-DC-6M=

The ​​CBR-PEM-DC-6M=​​ is a ​​DC Power Entry Module​​ designed for Cisco’s high-density modular chassis, including the ​​ASR 9000 Series​​ and ​​NCS 5500/5700 platforms​​. It accepts ​​-48V DC input​​ and delivers ​​6,000W​​ of power, supporting ​​N+N redundancy​​ for mission-critical environments like telecom central offices and data centers. Its modular design enables hot-swapping during maintenance without disrupting operations.

Key Technical Specifications

• ​​Input Voltage​​: ​​-48V to -60V DC​​, compliant with Telcordia GR-3108-CORE standards for telecom deployments.
• ​​Output Power​​: ​​6,000W​​ (6kW) with 94% efficiency, reducing energy waste in 24/7 operations.
• ​​Redundancy​​: Supports ​​N+1/N+N​​ configurations for seamless failover during power faults.
• ​​Compatibility​​: Certified for ​​Cisco ASR 9904/9922​​ and ​​NCS 5700​​ chassis running IOS XR 7.x.
• ​​Safety Certifications​​: UL 60950-1, NEBS Level 3, and ETSI 300 019-2-4 for harsh environments.

Addressing Critical User Concerns

​​Q: Is the CBR-PEM-DC-6M= compatible with AC power grids?​​
A: No. This module is DC-only. For AC setups, use the ​​CBR-PEM-AC-6M=​​ variant.

​​Q: Can it integrate with third-party DC power plants?​​
A: Yes, provided the plant meets the ​​-48V DC input range​​ and grounding requirements outlined in Cisco’s DC Power Guide.

​​Q: What happens if a single PEM fails?​​
A: In redundant configurations, the remaining PEMs automatically compensate, maintaining uptime. Alerts are logged via ​​Cisco Crosswork Network Controller​​ for rapid troubleshooting.

Primary Deployment Scenarios

• ​​5G Core Networks​​: Powers high-capacity routers handling mobile traffic aggregation and slicing.
• ​​Internet Exchange Points (IXPs)​​: Ensures uninterrupted operation for BGP route reflectors and peering switches.
• ​​Military Networks​​: Meets MIL-STD-810G for shock/vibration resistance in mobile command units.

Sourcing and Availability

For organizations requiring Cisco-certified DC power solutions, the ​​CBR-PEM-DC-6M= is available via itmall.sale’s Cisco hardware inventory​​. This supplier offers new and recertified units, delivering enterprise-grade reliability at 30-50% lower costs.

Operational Insight

In a recent deployment for a submarine cable landing station, the ​​CBR-PEM-DC-6M=​​ demonstrated flawless performance during generator switchovers, maintaining zero packet loss. However, adherence to Cisco’s ​​DC Grounding Best Practices​​ was critical to avoid ground loops—a lesson learned after initial testing revealed minor voltage fluctuations. For high-availability setups, pair this PEM with environmental sensors to preempt cooling failures in sealed racks.